Got jeans? Got a whole fucking pile of boring ass same shade man jeans? Make them interesting with toilet bleach! It's cheap, it's easy, it's bleeeeeeach!
Put your jeans in the bath and hose them down with the shower until they're covered by a couple of centimetres of water. Fabric has a habit of floating, so you might need to weight them down with pebbles or something. Now take a bottle of bleach and squirt it all over the jeans, agitate to dissolve it into a bleachy solution, and leave for about half an hour.
Drain the bath, rinse everything off, carefully carry your jeans to the washing machine and put them on a quick cycle with some detergent to get the bleach out. Dry them outside in the sunshine for an added bleaching.
And there's the contrast between the unaltered jeans and the bleached pair. It's not that strong, but it's better than nothing.
If you want to get this cool tie dye nebula effect, smoosh your jeans into a small bucket with bleach solution instead of doing them in the bath. The bleach will pool in some areas and be protected in others, leading to uneven bleaching.